base: Image should not acquire local roles

backport nexedi/erp5!666

/reviewed-on https://lab.nexedi.com/nexedi/erp5-capago/merge_requests/23

bt5/erp5_base/PortalTypeTemplateItem/portal_types/Image.xml

@@ -27,7 +27,7 @@
         </item>
         <item>
             <key> <string>acquire_local_roles</string> </key>
-            <value> <int>1</int> </value>
+            <value> <int>0</int> </value>
         </item>
         <item>
             <key> <string>content_icon</string> </key>